Question 1 :
A convex lens of focal length 20 cm can produce a magnified virtual as well as real image. Where shall the object be placed for obtaining REAL image?

Question 2 :
Refractive index of diamond with respect to glass is 1.6 and absolute refractive index of glass is 1.5. Find out the absolute refractive index of diamond.

Question 3 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19ced273b230584979b6c.PNG' /> <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61cc185478c526e972caea2a.PNG' /> In the above images, the first image is the ray of light incident on a concave mirror and the second image is the complete path of the ray. Is the second image correct depiction of the path?

Question 4 :
A student focussed the image of a candle flame on a white screen using a convex lens. He noted down the position of the candle screen and the lens as under: Position of candle = 12.0 cm, Position of convex lens = 50.0 cm, Position of the screen = 88.0 cm What will be the nature of the image formed if he further shifts the candle towards the lens, after he shifts the candle towards the lens at a position of 31.0 cm?

Question 6 :
The image of a candle flame formed by a lens is obtained on a screen placed on the other side of the lens. If the image is three times the size of the flame and the distance between lens and image is 80 cm, What is the nature of the lens.

Question 7 :
Identify the device used as a spherical mirror or lens in the given case. When the image formed is virtual and erect in this case. CASE: Object is placed between infinity and device, image formed is diminished and between pole and focus, behind it.

Question 8 :
Where will the image form by a convex lens, when an object is placed at infinity.

Question 9 :
Where will the image form by a convex lens, when an object is placed between optical centre and focus of the lens.

Question 10 :
What type of image will form by a concave lens, when an object is placed between focus and twice the focal length of the lens.